patch-2.2.18 linux/arch/m68k/mac/iop.c

• Lines: 721
• Date: Fri Oct 13 23:36:54 2000
• Orig file: v2.2.17/arch/m68k/mac/iop.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/arch/m68k/mac/iop.c linux/arch/m68k/mac/iop.c
@@ -0,0 +1,720 @@
+/*
+ * I/O Processor (IOP) management
+ * Written and (C) 1999 by Joshua M. Thompson (funaho@jurai.org)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice and this list of conditions.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice and this list of conditions in the documentation and/or other
+ *    materials provided with the distribution.
+ */
+
+/*
+ * The IOP chips are used in the IIfx and some Quadras (900, 950) to manage
+ * serial and ADB. They are actually a 6502 processor and some glue logic.
+ *
+ * 990429 (jmt) - Initial implementation, just enough to knock the SCC IOP
+ *		  into compatible mode so nobody has to fiddle with the
+ *		  Serial Switch control panel anymore.
+ * 990603 (jmt) - Added code to grab the correct ISM IOP interrupt for OSS
+ *		  and non-OSS machines (at least I hope it's correct on a
+ *		  non-OSS machine -- someone with a Q900 or Q950 needs to
+ *		  check this.)
+ * 990605 (jmt) - Rearranged things a bit wrt IOP detection; iop_present is
+ *		  gone, IOP base addresses are now in an array and the
+ *		  globally-visible functions take an IOP number instead of an
+ *		  an actual base address.
+ * 990610 (jmt) - Finished the message passing framework and it seems to work.
+ *		  Sending _definately_ works; my adb-bus.c mods can send
+ *		  messages and receive the MSG_COMPLETED status back from the
+ *		  IOP. The trick now is figuring out the message formats.
+ * 990611 (jmt) - More cleanups. Fixed problem where unclaimed messages on a
+ *		  receive channel were never properly acknowledged. Bracketed
+ *		  the remaining debug printk's with #ifdef's and disabled
+ *		  debugging. I can now type on the console.
+ * 990612 (jmt) - Copyright notice added. Reworked the way replies are handled.
+ *		  It turns out that replies are placed back in the send buffer
+ *		  for that channel; messages on the receive channels are always
+ *		  unsolicited messages from the IOP (and our replies to them
+ *		  should go back in the receive channel.) Also added tracking
+ *		  of device names to the listener functions ala the interrupt
+ *		  handlers.
+ * 990729 (jmt) - Added passing of pt_regs structure to IOP handlers. This is
+ *		  used by the new unified ADB driver.
+ *
+ * TODO:
+ *
+ * o Something should be periodically checking iop_alive() to make sure the
+ *   IOP hasn't died.
+ * o Some of the IOP manager routines need better error checking and
+ *   return codes. Nothing major, just prettying up.
+ */
+
+/*
+ * -----------------------
+ * IOP Message Passing 101
+ * -----------------------
+ *
+ * The host talks to the IOPs using a rather simple message-passing scheme via
+ * a shared memory area in the IOP RAM. Each IOP has seven "channels"; each
+ * channel is conneced to a specific software driver on the IOP. For example
+ * on the SCC IOP there is one channel for each serial port. Each channel has
+ * an incoming and and outgoing message queue with a depth of one.
+ *
+ * A message is 32 bytes plus a state byte for the channel (MSG_IDLE, MSG_NEW,
+ * MSG_RCVD, MSG_COMPLETE). To send a message you copy the message into the
+ * buffer, set the state to MSG_NEW and signal the IOP by setting the IRQ flag
+ * in the IOP control to 1. The IOP will move the state to MSG_RCVD when it
+ * receives the message and then to MSG_COMPLETE when the message processing
+ * has completed. It is the host's responsibility at that point to read the
+ * reply back out of the send channel buffer and reset the channel state back
+ * to MSG_IDLE.
+ *
+ * To receive message from the IOP the same procedure is used except the roles
+ * are reversed. That is, the IOP puts message in the channel with a state of
+ * MSG_NEW, and the host receives the message and move its state to MSG_RCVD
+ * and then to MSG_COMPLETE when processing is completed and the reply (if any)
+ * has been placed back in the receive channel. The IOP will then reset the
+ * channel state to MSG_IDLE.
+ *
+ * Two sets of host interrupts are provided, INT0 and INT1. Both appear on one
+ * interrupt level; they are distinguished by a pair of bits in the IOP status
+ * register. The IOP will raise INT0 when one or more messages in the send
+ * channels have gone to the MSG_COMPLETE state and it will raise INT1 when one
+ * or more messages on the receive channels have gone to the MSG_NEW state.
+ *
+ * Since each channel handles only one message we have to implement a small
+ * interrupt-driven queue on our end. Messages to e sent are placed on the
+ * queue for sending and contain a pointer to an optional callback function.
+ * The handler for a message is called when the message state goes to
+ * MSG_COMPLETE.
+ *
+ * For receiving message we maintain a list of handler functions to call when
+ * a message is received on that IOP/channel combination. The handlers are
+ * called much like an interrupt handler and are passed a copy of the message
+ * from the IOP. The message state will be in MSG_RCVD while the handler runs;
+ * it is the handler's responsibility to call iop_complete_message() when
+ * finished; this function moves the message state to MSG_COMPLETE and signals
+ * the IOP. This two-step process is provided to allow the handler to defer
+ * message processing to a bottom-half handler if the processing will take
+ * a signifigant amount of time (handlers are called at interrupt time so they
+ * should execute quickly.)
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+
+#include <asm/adb.h> 
+#include <asm/bootinfo.h> 
+#include <asm/macintosh.h> 
+#include <asm/macints.h> 
+#include <asm/mac_iop.h>
+#include <asm/mac_oss.h>
+
+/*#define DEBUG_IOP*/
+
+/* Set to nonezero if the IOPs are present. Set by iop_init() */
+
+int iop_scc_present,iop_ism_present;
+
+#ifdef CONFIG_PROC_FS
+
+/*
+ * sneaky reuse of the PROC_MAC_VIA inode. It's not needed by via.c
+ * anymore so we'll use it to debut the IOPs.
+ */
+
+int iop_get_proc_info(char *, char **, off_t, int, int);
+
+static struct proc_dir_entry proc_mac_iop = {
+	PROC_MAC_VIA, 7, "mac_iop",
+	S_IFREG | S_IRUGO, 1, 0, 0,
+	0, &proc_array_inode_operations,
+	&iop_get_proc_info
+};
+
+#endif /* CONFIG_PROC_FS */
+
+/* structure for tracking channel listeners */
+
+struct listener {
+	const char *devname;
+	void (*handler)(struct iop_msg *, struct pt_regs *);
+};
+
+/*
+ * IOP structures for the two IOPs
+ *
+ * The SCC IOP controls both serial ports (A and B) as its two functions.
+ * The ISM IOP controls the SWIM (floppy drive) and ADB.
+ */
+
+static volatile struct mac_iop *iop_base[NUM_IOPS];
+
+/*
+ * IOP message queues
+ */
+
+static struct iop_msg iop_msg_pool[NUM_IOP_MSGS];
+static struct iop_msg *iop_send_queue[NUM_IOPS][NUM_IOP_CHAN];
+static struct listener iop_listeners[NUM_IOPS][NUM_IOP_CHAN];
+
+void iop_ism_irq(int, void *, struct pt_regs *);
+
+extern void oss_irq_enable(int);
+
+/*
+ * Private access functions
+ */
+
+static __inline__ void iop_loadaddr(volatile struct mac_iop *iop, __u16 addr)
+{
+	iop->ram_addr_lo = addr;
+	iop->ram_addr_hi = addr >> 8;
+}
+
+static __inline__ __u8 iop_readb(volatile struct mac_iop *iop, __u16 addr)
+{
+	iop->ram_addr_lo = addr;
+	iop->ram_addr_hi = addr >> 8;
+	return iop->ram_data;
+}
+
+static __inline__ void iop_writeb(volatile struct mac_iop *iop, __u16 addr, __u8 data)
+{
+	iop->ram_addr_lo = addr;
+	iop->ram_addr_hi = addr >> 8;
+	iop->ram_data = data;
+}
+
+static __inline__ void iop_stop(volatile struct mac_iop *iop)
+{
+	iop->status_ctrl &= ~IOP_RUN;
+}
+
+static __inline__ void iop_start(volatile struct mac_iop *iop)
+{
+	iop->status_ctrl = IOP_RUN | IOP_AUTOINC;
+}
+
+static __inline__ void iop_bypass(volatile struct mac_iop *iop)
+{
+	iop->status_ctrl |= IOP_BYPASS;
+}
+
+static __inline__ void iop_interrupt(volatile struct mac_iop *iop)
+{
+	iop->status_ctrl |= IOP_IRQ;
+}
+
+static int iop_alive(volatile struct mac_iop *iop)
+{
+	int retval;
+
+	retval = (iop_readb(iop, IOP_ADDR_ALIVE) == 0xFF);
+	iop_writeb(iop, IOP_ADDR_ALIVE, 0);
+	return retval;
+}
+
+static struct iop_msg *iop_alloc_msg(void)
+{
+	int i;
+	ulong cpu_flags;
+
+	save_flags(cpu_flags);
+	cli();
+
+	for (i = 0 ; i < NUM_IOP_MSGS ; i++) {
+		if (iop_msg_pool[i].status == IOP_MSGSTATUS_UNUSED) {
+			iop_msg_pool[i].status = IOP_MSGSTATUS_WAITING;
+			restore_flags(cpu_flags);
+			return &iop_msg_pool[i];
+		}
+	}
+
+	restore_flags(cpu_flags);
+	return NULL;
+}
+
+static void iop_free_msg(struct iop_msg *msg)
+{
+	msg->status = IOP_MSGSTATUS_UNUSED;
+}
+
+/*
+ * Initialize the IOPs, if present.
+ */
+
+__initfunc(void iop_init(void))
+{
+	int i;
+	long tmp = 0;
+	volatile long *iop_bogon = &tmp;
+
+	if (macintosh_config->scc_type == MAC_SCC_IOP) {
+		if (macintosh_config->ident == MAC_MODEL_IIFX) {
+			iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_IIFX;
+		} else {
+			iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_QUADRA;
+		}
+
+		iop_scc_present = 1;
+
+		printk("IOP: detected SCC IOP at %p\n", iop_base[IOP_NUM_SCC]);
+		iop_base[IOP_NUM_SCC]->status_ctrl = 0;
+		iop_bypass(iop_base[IOP_NUM_SCC]);
+	} else {
+		iop_base[IOP_NUM_SCC] = NULL;
+		iop_scc_present = 0;
+	}
+	if (macintosh_config->adb_type == MAC_ADB_IOP) {
+		if (macintosh_config->ident == MAC_MODEL_IIFX) {
+			iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_IIFX;
+		} else {
+			iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_QUADRA;
+		}
+		iop_ism_present = 1;
+
+		printk("IOP: detected ISM IOP at %p\n", iop_base[IOP_NUM_ISM]);
+		iop_base[IOP_NUM_SCC]->status_ctrl = 0;
+		for (i = 0 ; i < 16; i++) {
+			*iop_bogon = *iop_bogon;
+		}
+		iop_start(iop_base[IOP_NUM_ISM]);
+		iop_alive(iop_base[IOP_NUM_ISM]); /* clears the alive flag */
+	} else {
+		iop_base[IOP_NUM_ISM] = NULL;
+		iop_ism_present = 0;
+	}
+
+	/* Make the whole pool available and empty the queues */
+
+	for (i = 0 ; i < NUM_IOP_MSGS ; i++) {
+		iop_msg_pool[i].status = IOP_MSGSTATUS_UNUSED;
+	}
+
+	for (i = 0 ; i < NUM_IOP_CHAN ; i++) {
+		iop_send_queue[IOP_NUM_SCC][i] = 0;
+		iop_send_queue[IOP_NUM_ISM][i] = 0;
+		iop_listeners[IOP_NUM_SCC][i].devname = NULL;
+		iop_listeners[IOP_NUM_SCC][i].handler = NULL;
+		iop_listeners[IOP_NUM_ISM][i].devname = NULL;
+		iop_listeners[IOP_NUM_ISM][i].handler = NULL;
+	}
+
+#ifdef CONFIG_PROC_FS
+	proc_register(&proc_root, &proc_mac_iop);
+#endif
+}
+
+/*
+ * Register the interrupt handler for the IOPs.
+ * TODO: might be wrong for non-OSS machines. Anyone?
+ */
+
+__initfunc(void iop_register_interrupts(void))
+{
+	if (iop_ism_present) {
+		if (oss_present) {
+			sys_request_irq(OSS_IRQLEV_IOPISM, iop_ism_irq,
+					IRQ_FLG_LOCK, "ISM IOP",
+					(void *) IOP_NUM_ISM);
+			oss_irq_enable(IRQ_MAC_ADB);
+		} else {
+			request_irq(IRQ_VIA2_0, iop_ism_irq,
+					IRQ_FLG_LOCK|IRQ_FLG_FAST, "ISM IOP",
+					(void *) IOP_NUM_ISM);
+		}
+		if (!iop_alive(iop_base[IOP_NUM_ISM])) {
+			printk("IOP: oh my god, they killed the ISM IOP!\n");
+		} else {
+			printk("IOP: the ISM IOP seems to be alive.\n");
+		}
+	}
+}
+
+/*
+ * Register or unregister a listener for a specific IOP and channel
+ *
+ * If the handler pointer is NULL the current listener (if any) is
+ * unregistered. Otherwise the new listener is registered provided
+ * there is no existing listener registered.
+ */
+
+int iop_listen(uint iop_num, uint chan,
+		void (*handler)(struct iop_msg *, struct pt_regs *),
+		const char *devname)
+{
+	if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return -EINVAL;
+	if (chan >= NUM_IOP_CHAN) return -EINVAL;
+	if (iop_listeners[iop_num][chan].handler && handler) return -EINVAL;
+	iop_listeners[iop_num][chan].devname = devname;
+	iop_listeners[iop_num][chan].handler = handler;
+	return 0;
+}
+
+/*
+ * Complete reception of a message, which just means copying the reply
+ * into the buffer, setting the channel state to MSG_COMPLETE and
+ * notifying the IOP.
+ */
+
+void iop_complete_message(struct iop_msg *msg)
+{
+	int iop_num = msg->iop_num;
+	int chan = msg->channel;
+	int i,offset;
+
+#ifdef DEBUG_IOP
+	printk("iop_complete(%p): iop %d chan %d\n", msg, msg->iop_num, msg->channel);
+#endif
+
+	offset = IOP_ADDR_RECV_MSG + (msg->channel * IOP_MSG_LEN);
+
+	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
+		iop_writeb(iop_base[iop_num], offset, msg->reply[i]);
+	}
+
+	iop_writeb(iop_base[iop_num],
+		   IOP_ADDR_RECV_STATE + chan, IOP_MSG_COMPLETE);
+	iop_interrupt(iop_base[msg->iop_num]);
+
+	iop_free_msg(msg);
+}
+
+/*
+ * Actually put a message into a send channel buffer
+ */
+
+static void iop_do_send(struct iop_msg *msg)
+{
+	volatile struct mac_iop *iop = iop_base[msg->iop_num];
+	int i,offset;
+
+	offset = IOP_ADDR_SEND_MSG + (msg->channel * IOP_MSG_LEN);
+
+	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
+		iop_writeb(iop, offset, msg->message[i]);
+	}
+
+	iop_writeb(iop, IOP_ADDR_SEND_STATE + msg->channel, IOP_MSG_NEW);
+
+	iop_interrupt(iop);
+}
+
+/*
+ * Handle sending a message on a channel that
+ * has gone into the IOP_MSG_COMPLETE state.
+ */
+
+static void iop_handle_send(uint iop_num, uint chan, struct pt_regs *regs)
+{
+	volatile struct mac_iop *iop = iop_base[iop_num];
+	struct iop_msg *msg,*msg2;
+	int i,offset;
+
+#ifdef DEBUG_IOP
+	printk("iop_handle_send: iop %d channel %d\n", iop_num, chan);
+#endif
+
+	iop_writeb(iop, IOP_ADDR_SEND_STATE + chan, IOP_MSG_IDLE);
+
+	if (!(msg = iop_send_queue[iop_num][chan])) return;
+
+	msg->status = IOP_MSGSTATUS_COMPLETE;
+	offset = IOP_ADDR_SEND_MSG + (chan * IOP_MSG_LEN);
+	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
+		msg->reply[i] = iop_readb(iop, offset);
+	}
+	if (msg->handler) (*msg->handler)(msg, regs);
+	msg2 = msg;
+	msg = msg->next;
+	iop_free_msg(msg2);
+
+	iop_send_queue[iop_num][chan] = msg;
+	if (msg) iop_do_send(msg);
+}
+
+/*
+ * Handle reception of a message on a channel that has
+ * gone into the IOP_MSG_NEW state.
+ */
+
+static void iop_handle_recv(uint iop_num, uint chan, struct pt_regs *regs)
+{
+	volatile struct mac_iop *iop = iop_base[iop_num];
+	int i,offset;
+	struct iop_msg *msg;
+
+#ifdef DEBUG_IOP
+	printk("iop_handle_recv: iop %d channel %d\n", iop_num, chan);
+#endif
+
+	msg = iop_alloc_msg();
+	msg->iop_num = iop_num;
+	msg->channel = chan;
+	msg->status = IOP_MSGSTATUS_UNSOL;
+	msg->handler = iop_listeners[iop_num][chan].handler;
+
+	offset = IOP_ADDR_RECV_MSG + (chan * IOP_MSG_LEN);
+
+	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
+		msg->message[i] = iop_readb(iop, offset);
+	}
+
+	iop_writeb(iop, IOP_ADDR_RECV_STATE + chan, IOP_MSG_RCVD);
+
+	/* If there is a listener, call it now. Otherwise complete */
+	/* the message ourselves to avoid possible stalls.         */
+
+	if (msg->handler) {
+		(*msg->handler)(msg, regs);
+	} else {
+#ifdef DEBUG_IOP
+		printk("iop_handle_recv: unclaimed message on iop %d channel %d\n", iop_num, chan);
+		printk("iop_handle_recv:");
+		for (i = 0 ; i < IOP_MSG_LEN ; i++) {
+			printk(" %02X", (uint) msg->message[i]);
+		}
+		printk("\n");
+#endif
+		iop_complete_message(msg);
+	}
+}
+
+/*
+ * Send a message
+ * 
+ * The message is placed at the end of the send queue. Afterwards if the
+ * channel is idle we force an immediate send of the next message in the
+ * queue.
+ */
+
+int iop_send_message(uint iop_num, uint chan, void *privdata,
+		      uint msg_len, __u8 *msg_data,
+		      void (*handler)(struct iop_msg *, struct pt_regs *))
+{
+	struct iop_msg *msg, *q;
+
+	if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return -EINVAL;
+	if (chan >= NUM_IOP_CHAN) return -EINVAL;
+	if (msg_len > IOP_MSG_LEN) return -EINVAL;
+
+	msg = iop_alloc_msg();
+	if (!msg) return -ENOMEM;
+
+	msg->next = NULL;
+	msg->status = IOP_MSGSTATUS_WAITING;
+	msg->iop_num = iop_num;
+	msg->channel = chan;
+	msg->caller_priv = privdata;
+	memcpy(msg->message, msg_data, msg_len);
+	msg->handler = handler;
+
+	if (!(q = iop_send_queue[iop_num][chan])) {
+		iop_send_queue[iop_num][chan] = msg;
+	} else {
+		while (q->next) q = q->next;
+		q->next = msg;
+	}
+
+	if (iop_readb(iop_base[iop_num],
+	    IOP_ADDR_SEND_STATE + chan) == IOP_MSG_IDLE) {
+		iop_do_send(msg);
+	}
+
+	return 0;
+}
+
+/*
+ * Upload code to the shared RAM of an IOP.
+ */
+
+void iop_upload_code(uint iop_num, __u8 *code_start,
+		     uint code_len, __u16 shared_ram_start)
+{
+	if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return;
+
+	iop_loadaddr(iop_base[iop_num], shared_ram_start);
+	
+	while (code_len--) {
+		iop_base[iop_num]->ram_data = *code_start++;
+	}
+}
+
+/*
+ * Download code from the shared RAM of an IOP.
+ */
+
+void iop_download_code(uint iop_num, __u8 *code_start,
+		       uint code_len, __u16 shared_ram_start)
+{
+	if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return;
+
+	iop_loadaddr(iop_base[iop_num], shared_ram_start);
+	
+	while (code_len--) {
+		*code_start++ = iop_base[iop_num]->ram_data;
+	}
+}
+
+/*
+ * Compare the code in the shared RAM of an IOP with a copy in system memory
+ * and return 0 on match or the first nonmatching system memory address on
+ * failure.
+ */
+
+__u8 *iop_compare_code(uint iop_num, __u8 *code_start,
+		       uint code_len, __u16 shared_ram_start)
+{
+	if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return code_start;
+
+	iop_loadaddr(iop_base[iop_num], shared_ram_start);
+	
+	while (code_len--) {
+		if (*code_start != iop_base[iop_num]->ram_data) {
+			return code_start;
+		}
+		code_start++;
+	}
+	return (__u8 *) 0;
+}
+
+/*
+ * Handle an ISM IOP interrupt
+ */
+
+void iop_ism_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+	uint iop_num = (uint) dev_id;
+	volatile struct mac_iop *iop = iop_base[iop_num];
+	int i,state;
+
+#ifdef DEBUG_IOP
+	printk("iop_ism_irq: status = %02X\n", (uint) iop->status_ctrl);
+#endif
+
+	/* INT0 indicates a state change on an outgoing message channel */
+
+	if (iop->status_ctrl & IOP_INT0) {
+		iop->status_ctrl = IOP_INT0 | IOP_RUN | IOP_AUTOINC;
+#ifdef DEBUG_IOP
+		printk("iop_ism_irq: new status = %02X, send states",
+			(uint) iop->status_ctrl);
+#endif
+		for (i = 0 ; i < NUM_IOP_CHAN  ; i++) {
+			state = iop_readb(iop, IOP_ADDR_SEND_STATE + i);
+#ifdef DEBUG_IOP
+			printk(" %02X", state);
+#endif
+			if (state == IOP_MSG_COMPLETE) {
+				iop_handle_send(iop_num, i, regs);
+			}
+		}
+#ifdef DEBUG_IOP
+		printk("\n");
+#endif
+	}
+
+	if (iop->status_ctrl & IOP_INT1) {	/* INT1 for incoming msgs */
+		iop->status_ctrl = IOP_INT1 | IOP_RUN | IOP_AUTOINC;
+#ifdef DEBUG_IOP
+		printk("iop_ism_irq: new status = %02X, recv states",
+			(uint) iop->status_ctrl);
+#endif
+		for (i = 0 ; i < NUM_IOP_CHAN ; i++) {
+			state = iop_readb(iop, IOP_ADDR_RECV_STATE + i);
+#ifdef DEBUG_IOP
+			printk(" %02X", state);
+#endif
+			if (state == IOP_MSG_NEW) {
+				iop_handle_recv(iop_num, i, regs);
+			}
+		}
+#ifdef DEBUG_IOP
+		printk("\n");
+#endif
+	}
+
+}
+
+#ifdef CONFIG_PROC_FS
+
+char *iop_chan_state(int state)
+{
+	switch(state) {
+		case IOP_MSG_IDLE	: return "idle      ";
+		case IOP_MSG_NEW	: return "new       ";
+		case IOP_MSG_RCVD	: return "received  ";
+		case IOP_MSG_COMPLETE	: return "completed ";
+		default			: return "unknown   ";
+	}
+}
+
+int iop_dump_one_iop(char *buf, int iop_num, char *iop_name)
+{
+	int i,len = 0;
+	volatile struct mac_iop *iop = iop_base[iop_num];
+
+	len += sprintf(buf+len, "%s IOP channel states:\n\n", iop_name);
+	len += sprintf(buf+len, "##  send_state  recv_state  device\n");
+	len += sprintf(buf+len, "------------------------------------------------\n");
+	for (i = 0 ; i < NUM_IOP_CHAN ; i++) {
+		len += sprintf(buf+len, "%2d  %10s  %10s  %s\n", i,
+			iop_chan_state(iop_readb(iop, IOP_ADDR_SEND_STATE+i)),
+			iop_chan_state(iop_readb(iop, IOP_ADDR_RECV_STATE+i)),
+			iop_listeners[iop_num][i].handler?
+				      iop_listeners[iop_num][i].devname : "");
+			
+	}
+	len += sprintf(buf+len, "\n");
+	return len;
+}
+ 
+int iop_get_proc_info(char *buf, char **start, off_t pos, int count, int wr)
+{
+	int len, cnt;
+
+	cnt = 0;
+	len =  sprintf(buf, "IOPs detected:\n\n");
+
+	if (iop_scc_present) {
+		len += sprintf(buf+len, "SCC IOP (%p): status %02X\n",
+				iop_base[IOP_NUM_SCC],
+				(uint) iop_base[IOP_NUM_SCC]->status_ctrl);
+	}
+	if (iop_ism_present) {
+		len += sprintf(buf+len, "ISM IOP (%p): status %02X\n\n",
+				iop_base[IOP_NUM_ISM],
+				(uint) iop_base[IOP_NUM_ISM]->status_ctrl);
+	}
+
+	if (iop_scc_present) {
+		len += iop_dump_one_iop(buf+len, IOP_NUM_SCC, "SCC");
+
+	}
+
+	if (iop_ism_present) {
+		len += iop_dump_one_iop(buf+len, IOP_NUM_ISM, "ISM");
+
+	}
+
+	if (len >= pos) {
+		if (!*start) {
+			*start = buf + pos;
+			cnt = len - pos;
+		} else {
+			cnt += len;
+		}
+	}
+	return (count > cnt) ? cnt : count;
+}
+#endif /* CONFIG_PROC_FS */